To have a viable RF link 60% of the Fresnel Zone must be free of obstructions. The Fresnel Zone is at its widest in the middle of the link. There are formulae that can work out what clearance you need at certain points along the link but most of the time it is best just to make sure there is plenty of gap, and do a wireless site survey first.

In my expierence, you can pretty much rule out anything with trees in the way. Unless there is a gap you can aim through, or they are very thin where you can see the colour of the sky through the tree then its a no-go.

Ray TaylorTaylor Broadband (rural hawkes bay)www.ruralkiwi.com

There is no place like localhostFor my general guide to extending your wireless network Click Here

What speeds are you needing? If you go with lower frequency ie 900mhz gear this i have found in the past more suitable for obstructions and good for distance, but it is limited in speed, ie 2mpbs but can have very low latency which is a benefit also.

Hey dynamic - sorry to go a little off topic, Can you suggest some 900mhz radios that you have used. I have looked but cant really find much because half the FCC's unlicenced 900mhz band is used by our cellphone networks and all locked up.

I would be interested in playing around with some to see how they go through trees myself.

Ray TaylorTaylor Broadband (rural hawkes bay)www.ruralkiwi.com

There is no place like localhostFor my general guide to extending your wireless network Click Here

I think anything using OFDM has a better chance of getting a signal through or even bounced off nearby obstacles. Not sure if any wifi equipment would have those capabilities but might be carrier-grade stuff.

Qualified in business, certified in fibre, stuck in copper, have to keep going ^_^